McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 151. |
when the metal is stresses above its elastic limit, the resulting deformation is |
| A. | permenant |
| B. | temporary |
| C. | partially permenant |
| D. | a or c |
| Answer» D. a or c | |
| 152. |
stress required during plastic deformation is than that required during elastic deformation |
| A. | equal |
| B. | high |
| C. | low |
| D. | b or c |
| Answer» B. high | |
| 153. |
different shapes can be permentaly given to metals by virtue of property |
| A. | elastic |
| B. | plastic |
| C. | none of the above |
| D. | both a and b |
| Answer» B. plastic | |
| 154. |
mechannnial properties of the metal after plastic deformation |
| A. | increases |
| B. | either increase or decrease |
| C. | remains constant |
| D. | none of the above |
| Answer» B. either increase or decrease | |
| 155. |
the plastic deformation can takes place through |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» D. all of the above | |
| 156. |
slip is defined as displacement of one part of crystal relative to other |
| A. | tensile |
| B. | compressive |
| C. | shear |
| D. | bending |
| Answer» C. shear | |
| 157. |
slip takes place due to |
| A. | stress applied on material |
| B. | chemical reaction within material |
| C. | atmospheric reaction |
| D. | none of the above |
| Answer» A. stress applied on material | |
| 158. |
slip occurs along plane and in direction |
| A. | random, specific |
| B. | specific, random |
| C. | random, random |
| D. | specific, specific |
| Answer» D. specific, specific | |
| 159. |
the plane on which slip takes place is called plane |
| A. | defective |
| B. | imperfect |
| C. | slip |
| D. | twin |
| Answer» C. slip | |
| 160. |
in slip, the crystal structure above and below the plane remains |
| A. | distorted |
| B. | undistorted |
| C. | sometimes distorted |
| D. | none of the above |
| Answer» B. undistorted | |
| 161. |
slip occurs on plae which has |
| A. | least number of atoms |
| B. | random number of atoms |
| C. | maximum number of atoms |
| D. | no atoms |
| Answer» C. maximum number of atoms | |
| 162. |
slip direction is direction in the slip plane which has |
| A. | least number of atoms |
| B. | random number of atoms |
| C. | maximum number of atoms |
| D. | no atoms |
| Answer» C. maximum number of atoms | |
| 163. |
twin takes place due to |
| A. | stress applied on material |
| B. | chemical reaction within material |
| C. | atmospheric reaction |
| D. | none of the above |
| Answer» A. stress applied on material | |
| 164. |
in twinning, the structure in the distorted region forms of the crystal structure in the distorted region |
| A. | random orientation |
| B. | mirror image |
| C. | a or b |
| D. | none of the above |
| Answer» B. mirror image | |
| 165. |
the planes along which mirror image is formed is called planes |
| A. | defective |
| B. | imperfect |
| C. | slip |
| D. | twin |
| Answer» D. twin | |
| 166. |
the plastic deformation takes place due to and |
| A. | slip |
| B. | twin |
| C. | both of the above |
| D. | none of the above |
| Answer» C. both of the above | |
| 167. |
twining is the phenomenon observed due to |
| A. | mechanical treatment |
| B. | thermal treatment |
| C. | chemical treatment |
| D. | a or b |
| Answer» D. a or b | |
| 168. |
metals are more ductile than metals |
| A. | bcc,fcc |
| B. | fcc,bcc |
| C. | hcp,bcc |
| D. | bcc,hcp |
| Answer» B. fcc,bcc | |
| 169. |
generally metals with crystal structure are more ductile |
| A. | bcc |
| B. | fcc |
| C. | hcp |
| D. | a and c |
| Answer» B. fcc | |
| 170. |
generally metals with crystal structure shows plastic deformation mainly by slip mechanism |
| A. | bcc |
| B. | fcc |
| C. | hcp |
| D. | a and c |
| Answer» D. a and c | |
| 171. |
generally metals with crystal structure shows plastic deformation mainly by twinning mechanism |
| A. | bcc |
| B. | fcc |
| C. | hcp |
| D. | a and c |
| Answer» C. hcp | |
| 172. |
twinning occurs along plane and direction |
| A. | random, specific |
| B. | specific, random |
| C. | random, random |
| D. | specific, specific |
| Answer» D. specific, specific | |
| 173. |
requires more stress to be initiated with respect to |
| A. | slip, twinning |
| B. | twinning, slip |
| C. | grain boundary defect, slip |
| D. | none of the above |
| Answer» B. twinning, slip | |
| 174. |
as compared to slip the stress required to propogate twin is |
| A. | more |
| B. | lesser |
| C. | constant |
| D. | varies randomly |
| Answer» B. lesser | |
| 175. |
the appears as a pair of thick lines in the microscopic structure even after polishing |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» B. twinning | |
| 176. |
The appears as a single thin line in the microscopic structure |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» A. slip | |
| 177. |
the disappears after polishing |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» A. slip | |
| 178. |
the can be seen in metal even after polishing |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» B. twinning | |
| 179. |
the mechanism can be takes place due to thermal treatment |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» B. twinning | |
| 180. |
metals with FCC crystal structure are often subjected to |
| A. | slip |
| B. | twinning |
| C. | less of slip and more of twinning |
| D. | all of the above |
| Answer» D. all of the above | |
| 181. |
metals with FCC and BCC crystal structure are often subjected to |
| A. | slip |
| B. | twinning |
| C. | combination of slip and twinning |
| D. | all of the above |
| Answer» D. all of the above | |
| 182. |
number of slip systems in metals decides about |
| A. | hardness of metals |
| B. | strength of metal |
| C. | ductility of metal |
| D. | all of the above |
| Answer» C. ductility of metal | |
| 183. |
number of slip systems in FCC are |
| A. | 12 |
| B. | 24 |
| C. | 21 |
| D. | 26 |
| Answer» A. 12 | |
| 184. |
the law is used to determine the value of critical shear stress |
| A. | millers |
| B. | burgers |
| C. | schmids |
| D. | none of the above |
| Answer» C. schmids | |
| 185. |
the schmids law is used to calculate critical shear stress for _ structure |
| A. | polycrystalli ne |
| B. | single crystal |
| C. | atoms |
| D. | none of the above |
| Answer» B. single crystal | |
| 186. |
the maximum resolved shear stress is given by |
| A. | Ƭresolve = σt |
| B. | Ƭresolve = σt/3 |
| C. | Ƭresolve = σt/2 |
| D. | none of the above |
| Answer» C. Ƭresolve = σt/2 | |
| 187. |
slip starts to occur when the value of resolved shear stress |
| A. | reduces below critical shear stress |
| B. | is at critical shear stress |
| C. | increases abive critical shear stress |
| D. | none of the above |
| Answer» C. increases abive critical shear stress | |
| 188. |
FCC metals have value of critical shear stress as compared to BCC metals |
| A. | same |
| B. | lower |
| C. | higher |
| D. | random |
| Answer» B. lower | |
| 189. |
FCC metals have higher ductility than BCC metals since _ |
| A. | fcc metals have higher |
| B. | fcc metals have lower |
| C. | fcc metals have lower |
| D. | fcc metals have higher |
| Answer» B. fcc metals have lower | |
| 190. |
the phenomenon by virtue of which metals become harder and stronger without any heat treatment is called |
| A. | strain hardening |
| B. | work hardening |
| C. | all of the above |
| D. | none of the above |
| Answer» C. all of the above | |
| 191. |
after intial cold working, the stress required to further deform the material is |
| A. | same |
| B. | lower |
| C. | higher |
| D. | random |
| Answer» C. higher | |
| 192. |
work hardening is the phenomenon observed if metal is worked the recrystallization temperature |
| A. | above |
| B. | below |
| C. | independent of |
| D. | none of the above |
| Answer» C. independent of | |
| 193. |
working of metal below crystallization temperature is known as |
| A. | cold working |
| B. | hot working |
| C. | any one of above |
| D. | none of the above |
| Answer» A. cold working | |
| 194. |
working of metal above crystallization temperature is known as |
| A. | cold working |
| B. | hot working |
| C. | any one of above |
| D. | none of the above |
| Answer» B. hot working | |
| 195. |
for a given metal its recrystallization temperature depends on |
| A. | amonut of cold working |
| B. | grain size |
| C. | melting temperature s |
| D. | all of the above |
| Answer» D. all of the above | |
| 196. |
finer is the grain size - |
| A. | more is recrystalliza tion temperature |
| B. | lesser is the recrystalliza tion temperature |
| C. | recrystalliza tion temperature remains same |
| D. | none of the above |
| Answer» B. lesser is the recrystalliza tion temperature | |
| 197. |
Frank-Reed source is associated with - |
| A. | vacancy and interstitial defect |
| B. | reductiion in dislocations |
| C. | multiplicati on of dislocations |
| D. | none of the above |
| Answer» C. multiplicati on of dislocations | |
| 198. |
finer is the grain size - |
| A. | more is dislocation density in cold working |
| B. | lesser is dislocation density in cold working |
| C. | dislocation density in cold working remains same |
| D. | none of the above |
| Answer» A. more is dislocation density in cold working | |
| 199. |
the mechanism of plastic deformation in polycrystalline material is than the mechanism in single crystal structure |
| A. | simpler |
| B. | complex |
| C. | same |
| D. | random |
| Answer» B. complex | |
| 200. |
the stress required to produce same deformation is higher in case of polycrystalline material as compared to polycrystalline materials |
| A. | coarse garined, fine grained |
| B. | fine grained, coarse grained |
| C. | a or b |
| D. | none of the above |
| Answer» C. a or b | |
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